This figure shows a 5 by 4 2-D core grid, with vertices denoted by bullet symbols. A row of rind points is shown on the left and right, at the minimum and maximum i-faces, with vertices denoted by "X" symbols.

The lower-left, lower-right, and upper-right core vertices are labeled (1,1), (5,1), and (5,4), respectively. The rind vertices at the lower-left and lower-right are labeled (0,1) and (6,1).